That would indeed seem to be a critical piece of missing information.
Another would be if it stays fired the whole time or is somehow cycling
on and off. Also depends on pre-heating to what temp? 300? 450?
I don't know if gas ovens have changed, but a few years ago I replaced
my electric ovens and the new ones definitely take longer to heat up
compared to the 25 year old ones.
I'm guessing maybe 50% longer. If I had known this before I switched,
I would have measured it to confirm it. I think it probably takes at least
20 mins to get to 400F. Next time I run it I'll time it, just to know.

With energy efficiency standards now days, that
might be the best you can do.
I'd ask the store or manufacturer if you'd get
faster preheat times, if you put a cake pan of
low octane gasoline in the broiler, and lit that
off as part of the preheat.
Are you certified for thermite? That might help.

Mine takes 19 minutes to get to 550F. Twice since I've had it it started
to take longer. One time the igniter failed shortly after that, the
other time the igniter didn't out right fail, but replacing it fixed the
problem.

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